Detonator for ordnance-shells.



1 KELLER. DETONATOR FOR ORDNANCE SHELLS. APPLICATION man MAY l5. 191e.

1,221,453. n Patented Apr. 3, 1917.

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OFFICE.

JULIUS KELLER, F FOND .'DU LAC, WISCONSIN.

DETONATOR FOR ORDNANCE-SHELLS.

Specication of Letters Patent.

Patented. Apr. 3, 1917.

Application filed May 15, 1916. Serial No. 97,483.

To all lwhom t may concern.'

Be it known that I, JULIUs KELLER, a citizen of the United States, residing at Fond du Lac, in the county of Fond du Lac and State of Visconsim'have invented certain new and useful Improvements in Detonators for Ordnance-Shells, of which the following is a spccication.

This invention relate's to detonators of the type in which a needle is employed to ire the detonating cap, said needle being movable relatively to a tubular guide. In detonators of the prior art the operation of securing the needle in relation to its tubular guide has consumed much time, and has been diiiicult to perform w'ith accuracy.

The object of the present invention is to provide a construction whereby the needle may be accurately and quickly secured in place in proper relation to its guide.

In the accompanying drawings, Figure l is an elevation showing the needle in place ready to be attached to its supporting ring. Fig. 2 is a similar view, but showing the needle secured in place. Fig. 3 is a longitudinal central sectional view. Fig. 4 is a transverse sectional view taken in the plane of dotted line 4 4 of Fig. 2. Fig. 5 is a detail view of the needle. Fig. 6 is a detail view of the needle-supporting ring.

In the drawings, l denotes the tubular guide for the firing needle 2. The needle 2 is provided with a T-head or base 8, the opposite ends 4 of which are `of wedging or dovetail form. The head 3 is secured to a ring 5 which is slidably mounted upon the tubular guide l. At diametrically opposite points in the ring 5 are formed two notches 6 which originally are of rectangular form, as shown in Fig. 6. The opposite walls of each notch 6 are extended to form the projections 7. The dovetailends 4: of the head 3 are adapted to iit freely within the notches 6. As indicated in the drawings, the guide l has an elongated opening 8 extending therethrough.

In assembling the parts, the ring 5 is placed upon the guide l, the needle 2 is laterally inserted through the opening S into the guide l, the ends I of the head entering the notches 6. A centering device (not shown) is then inserted into the bore of the tubular guide 1, said device having a recess to receive the point of the needle 2. The centering device fits suiiiciently snugly within the bore of the guide 1 so as to hold the needle 2 firmly with the' axis of the needle 2 lying in the axis of the guide l. While the needle is thus held in central position, the projections 7 are forced toward each other and toward the bottom of the notches 6, whereby the metal of said projections and the opposite walls of the notches 6 is driven into contact with the ends 4: of the needle-head 8. As shown in Fig. 2, the opera-tion of forcing the metal of the projections 7 and the opposite walls of the notches 6 against the ends t gives said notches. a dovetail shape conforming to the dovetail form of the ends 4:. Inasmuch as the metal of the projections 7 and the notch walls is driven tightly against the projections 4, said projections are rigidly secured to the ring 5. Since the needle 2 is posij tively held in proper relation to the guide 1 while the base of the needle is being secured to the ring 5, it will be seen that the needle will be secured to the ring 5 in proper position to slide freely and accurately with relation to the bore of the guide l.

I claim as myinvention:

l. In a detonator, a ring having a notch therein, said notch being of generally rectangular form, a projection at one side of the notch', and a firing needle having a head adapted to lie in said notch, and the metal of said projection being adapted to be forced into Contact with said head.

2. In a detonator, a ring having a notch therein, said notch being of generally rec` tangular form, projections at opposite sides of the notch, and a firing needle having a head provided with a. dovetail portion, said dovetail portion being adapted to lie in said notch, and the metal of said projections beadapted to be forced into contact with said dovetail portion.

3. The process of assembling a detonator consisting in placing a needle within its tubular guide, holding the needle'in axial relation to the guide with the head of the needle lying in a rectangular notch in the ring, said ring having projections at opposite sides of the notch, and forcing the metal of said projections into clamping contact with the needle head while the needle is being held in axial relation to the guide.

In testimony whereof, I have hereunto set my hand.

JULIUS KELLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, '.D. G. 

